A sound wave in a steel rail has a frequency of 620 Hz and a wave of 10.5 M. What is the speed of sound in the steel?

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.